668087361 has 6 divisors (see below), whose sum is σ = 965015090. Its totient is φ = 445391568.

The previous prime is 668087359. The next prime is 668087363. The reversal of 668087361 is 163780866.

It is an interprime number because it is at equal distance from previous prime (668087359) and next prime (668087363).

It can be written as a sum of positive squares in only one way, i.e., 553190400 + 114896961 = 23520^2 + 10719^2 .

It is not a de Polignac number, because 668087361 - 2¹ = 668087359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (668087363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37115956 + ... + 37115973.

Almost surely, 2^668087361 is an apocalyptic number.

It is an amenable number.

668087361 is a deficient number, since it is larger than the sum of its proper divisors (296927729).

668087361 is a wasteful number, since it uses less digits than its factorization.

668087361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74231935 (or 74231932 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 668087361 is about 25847.3859606731. The cubic root of 668087361 is about 874.2005698627.

The spelling of 668087361 in words is "six hundred sixty-eight million, eighty-seven thousand, three hundred sixty-one".